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Mercedes’ DiesOtto engine does 39MPG in a S-class

Mercedes’ DiesOtto engine does 39MPG in a S-class

James Martinez July 24th, 2007 James Martinez By James Martinez Author July 24th, 2007
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December 31st, 1969 Mercedes is attempting to beat rival Volkswagen to the market with the world’s first mass produced petrol engine that combines the torque and fuel economy of modern diesels with cleaner emissions. Efficient features that have been added to the engine include direct injection, turbocharging and variable compression. Unlike the VW design, the Mercedes engine doesn’t require special synthetic fuels and runs on regular petrol. The initial concept engine is a small 1.8L four-cylinder, which delivers an amazing 238hp (175kW) and 400Nm of torque. Initial tests have seen fuel consumption at around 39mpg (6L/100km), and this was in a large S-class saloon. The engine works by using sparkless ignition, like a diesel, during low load conditions, and switches back to using a spark plug on cold starts and under full load. Engineers have another trick up their sleeves. Fuel economy will improve even further with the addition of new hybrid technology, including an integrated starter-generator attached to the flywheel.
Mercedes’ DiesOtto engine does 39MPG in a S-class

Mercedes’ DiesOtto engine does 39MPG in a S-class

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Mercedes is attempting to beat rival Volkswagen to the market with the world’s first mass produced petrol engine that combines the torque and fuel economy of modern diesels with cleaner emissions. Efficient features that have been added to the engine include direct injection, turbocharging and variable compression. Unlike the VW design, the Mercedes engine doesn’t require special synthetic fuels and runs on regular petrol.

The initial concept engine is a small 1.8L four-cylinder, which delivers an amazing 238hp (175kW) and 400Nm of torque. Initial tests have seen fuel consumption at around 39mpg (6L/100km), and this was in a large S-class saloon. The engine works by using sparkless ignition, like a diesel, during low load conditions, and switches back to using a spark plug on cold starts and under full load.

Engineers have another trick up their sleeves. Fuel economy will improve even further with the addition of new hybrid technology, including an integrated starter-generator attached to the flywheel.

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Posted in: Mercedes Benz, News


Comments (2 total)

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  1. By Gus #1, Posted: 7/25/2007

    So basically what we're seeing is technology that can squeeze more than the current ~25% out of a drop of gasoline.
    Gasoline is a very good fuel, we waste 75% as heat and noise, so if we could just get more out of it...

  2. By Nuno Pereira #2, Posted: 8/16/2007

    Finally hcci is near mass production. The diesel engine had made us waist time and hcci should have been the way to go. It´s clean, very clean and eficient and a very good replacement for the dirtier diesel engine.
    HCCI is not a diesel combustion (constant pressure), but a Otto one with it´s very fast combustion (constant volume) with low temperature and homogeonous charge .
    HCCI is a cold detonatiing combustion. One other advantage of Hcci is the abbility to rev like a gasoline engine if necessary (17000 rpm have already been achieved).

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